3 |
use warnings; |
use warnings; |
4 |
use strict; |
use strict; |
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use blib; |
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use WebPAC::Common; |
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use base qw/WebPAC::Common/; |
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use Text::Iconv; |
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use Data::Dumper; |
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|
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=head1 NAME |
=head1 NAME |
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|
15 |
WebPAC::Input - core module for input file format |
WebPAC::Input - read different file formats into WebPAC |
16 |
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|
17 |
=head1 VERSION |
=head1 VERSION |
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|
19 |
Version 0.01 |
Version 0.05 |
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=cut |
=cut |
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|
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our $VERSION = '0.01'; |
our $VERSION = '0.05'; |
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|
25 |
=head1 SYNOPSIS |
=head1 SYNOPSIS |
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|
27 |
This module will load particular loader module and execute it's functions. |
This module implements input as database which have fixed and known |
28 |
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I<size> while indexing and single unique numeric identifier for database |
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position ranging from 1 to I<size>. |
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Simply, something that is indexed by unmber from 1 .. I<size>. |
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Examples of such databases are CDS/ISIS files, MARC files, lines in |
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text file, and so on. |
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|
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Specific file formats are implemented using low-level interface modules, |
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located in C<WebPAC::Input::*> namespace which export C<open_db>, |
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C<fetch_rec> and optional C<init> functions. |
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|
40 |
Perhaps a little code snippet. |
Perhaps a little code snippet. |
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|
42 |
use WebPAC::Input; |
use WebPAC::Input; |
43 |
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|
44 |
my $db = WebPAC::Input->new( |
my $db = WebPAC::Input->new( |
45 |
format => 'NULL', |
module => 'WebPAC::Input::ISIS', |
46 |
config => $config, |
config => $config, |
47 |
lookup => $lookup_obj, |
lookup => $lookup_obj, |
48 |
|
low_mem => 1, |
49 |
); |
); |
50 |
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|
51 |
$db->open('/path/to/database'); |
$db->open('/path/to/database'); |
52 |
print "database size: ",$db->size,"\n"; |
print "database size: ",$db->size,"\n"; |
53 |
while (my $row = $db->fetch) { |
while (my $rec = $db->fetch) { |
54 |
... |
# do something with $rec |
55 |
} |
} |
56 |
$db->close; |
|
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|
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|
59 |
=head1 FUNCTIONS |
=head1 FUNCTIONS |
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|
63 |
Create new input database object. |
Create new input database object. |
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|
65 |
my $db = new WebPAC::Input( |
my $db = new WebPAC::Input( |
66 |
format => 'NULL' |
module => 'WebPAC::Input::MARC', |
67 |
code_page => 'ISO-8859-2', |
code_page => 'ISO-8859-2', |
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low_mem => 1, |
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recode => 'char pairs', |
70 |
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no_progress_bar => 1, |
71 |
); |
); |
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|
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C<module> is low-level file format module. See L<WebPAC::Input::Isis> and |
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L<WebPAC::Input::MARC>. |
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|
76 |
Optional parametar C<code_page> specify application code page (which will be |
Optional parametar C<code_page> specify application code page (which will be |
77 |
used internally). This should probably be your terminal encoding, and by |
used internally). This should probably be your terminal encoding, and by |
78 |
default, it C<ISO-8859-2>. |
default, it C<ISO-8859-2>. |
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|
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Default is not to use C<low_mem> options (see L<MEMORY USAGE> below). |
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|
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C<recode> is optional string constisting of character or words pairs that |
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should be replaced in input stream. |
84 |
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|
85 |
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C<no_progress_bar> disables progress bar output on C<STDOUT> |
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|
87 |
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This function will also call low-level C<init> if it exists with same |
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parametars. |
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|
90 |
=cut |
=cut |
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|
92 |
sub new { |
sub new { |
93 |
my $class = shift; |
my $class = shift; |
94 |
my $self = {@_}; |
my $self = {@_}; |
95 |
bless($self, $class); |
bless($self, $class); |
96 |
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|
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my $log = $self->_get_logger; |
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99 |
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$log->logconfess("specify low-level file format module") unless ($self->{module}); |
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my $module = $self->{module}; |
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$module =~ s#::#/#g; |
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$module .= '.pm'; |
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$log->debug("require low-level module $self->{module} from $module"); |
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105 |
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require $module; |
106 |
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#eval $self->{module} .'->import'; |
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108 |
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# check if required subclasses are implemented |
109 |
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foreach my $subclass (qw/open_db fetch_rec init/) { |
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my $n = $self->{module} . '::' . $subclass; |
111 |
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if (! defined &{ $n }) { |
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my $missing = "missing $subclass in $self->{module}"; |
113 |
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$self->{$subclass} = sub { $log->logwarn($missing) }; |
114 |
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} else { |
115 |
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$self->{$subclass} = \&{ $n }; |
116 |
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} |
117 |
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} |
118 |
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119 |
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if ($self->{init}) { |
120 |
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$log->debug("calling init"); |
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$self->{init}->($self, @_); |
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} |
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124 |
$self->{'code_page'} ||= 'ISO-8859-2'; |
$self->{'code_page'} ||= 'ISO-8859-2'; |
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|
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# running with low_mem flag? well, use DBM::Deep then. |
127 |
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if ($self->{'low_mem'}) { |
128 |
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$log->info("running with low_mem which impacts performance (<32 Mb memory usage)"); |
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|
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my $db_file = "data.db"; |
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|
132 |
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if (-e $db_file) { |
133 |
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unlink $db_file or $log->logdie("can't remove '$db_file' from last run"); |
134 |
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$log->debug("removed '$db_file' from last run"); |
135 |
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} |
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require DBM::Deep; |
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139 |
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my $db = new DBM::Deep $db_file; |
140 |
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$log->logdie("DBM::Deep error: $!") unless ($db); |
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143 |
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if ($db->error()) { |
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$log->logdie("can't open '$db_file' under low_mem: ",$db->error()); |
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} else { |
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$log->debug("using file '$db_file' for DBM::Deep"); |
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} |
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149 |
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$self->{'db'} = $db; |
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} |
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|
152 |
$self ? return $self : return undef; |
$self ? return $self : return undef; |
153 |
} |
} |
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=head2 open |
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This function will read whole database in memory and produce lookups. |
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159 |
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$input->open( |
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path => '/path/to/database/file', |
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code_page => '852', |
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limit => 500, |
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offset => 6000, |
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lookup => $lookup_obj, |
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stats => 1, |
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); |
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By default, C<code_page> is assumed to be C<852>. |
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C<offset> is optional parametar to position at some offset before reading from database. |
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C<limit> is optional parametar to read just C<limit> records from database |
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C<stats> create optional report about usage of fields and subfields |
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|
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Returns size of database, regardless of C<offset> and C<limit> |
177 |
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parametars, see also C<size>. |
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|
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=cut |
180 |
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|
181 |
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sub open { |
182 |
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my $self = shift; |
183 |
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my $arg = {@_}; |
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185 |
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my $log = $self->_get_logger(); |
186 |
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187 |
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$log->logcroak("need path") if (! $arg->{'path'}); |
188 |
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my $code_page = $arg->{'code_page'} || '852'; |
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|
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# store data in object |
191 |
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$self->{'input_code_page'} = $code_page; |
192 |
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foreach my $v (qw/path offset limit/) { |
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$self->{$v} = $arg->{$v} if ($arg->{$v}); |
194 |
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} |
195 |
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|
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# create Text::Iconv object |
197 |
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$self->{iconv} = Text::Iconv->new($code_page,$self->{'code_page'}); |
198 |
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|
199 |
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my $filter_ref; |
200 |
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|
201 |
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if ($self->{recode}) { |
202 |
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my @r = split(/\s/, $self->{recode}); |
203 |
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if ($#r % 2 != 1) { |
204 |
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$log->logwarn("recode needs even number of elements (some number of valid pairs)"); |
205 |
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} else { |
206 |
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my $recode; |
207 |
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while (@r) { |
208 |
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my $from = shift @r; |
209 |
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my $to = shift @r; |
210 |
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$recode->{$from} = $to; |
211 |
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} |
212 |
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my $regex = join '|' => keys %{ $recode }; |
214 |
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|
215 |
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$log->debug("using recode regex: $regex"); |
216 |
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|
217 |
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$filter_ref = sub { |
218 |
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my $t = shift; |
219 |
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$t =~ s/($regex)/$recode->{$1}/g; |
220 |
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return $t; |
221 |
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}; |
222 |
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|
223 |
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} |
224 |
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|
225 |
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} |
226 |
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|
227 |
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my ($db, $size) = $self->{open_db}->( $self, |
228 |
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path => $arg->{path}, |
229 |
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filter => $filter_ref, |
230 |
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%{ $arg }, |
231 |
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); |
232 |
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|
233 |
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unless (defined($db)) { |
234 |
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$log->logwarn("can't open database $arg->{path}, skipping..."); |
235 |
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return; |
236 |
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} |
237 |
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|
238 |
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unless ($size) { |
239 |
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$log->logwarn("no records in database $arg->{path}, skipping..."); |
240 |
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return; |
241 |
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} |
242 |
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|
243 |
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my $from_rec = 1; |
244 |
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my $to_rec = $size; |
245 |
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|
246 |
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if (my $s = $self->{offset}) { |
247 |
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$log->debug("skipping to MFN $s"); |
248 |
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$from_rec = $s; |
249 |
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} else { |
250 |
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$self->{offset} = $from_rec; |
251 |
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} |
252 |
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|
253 |
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if ($self->{limit}) { |
254 |
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$log->debug("limiting to ",$self->{limit}," records"); |
255 |
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$to_rec = $from_rec + $self->{limit} - 1; |
256 |
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$to_rec = $size if ($to_rec > $size); |
257 |
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} |
258 |
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|
259 |
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# store size for later |
260 |
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$self->{size} = ($to_rec - $from_rec) ? ($to_rec - $from_rec + 1) : 0; |
261 |
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|
262 |
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$log->info("processing $self->{size}/$size records [$from_rec-$to_rec] convert $code_page -> $self->{code_page}", $self->{stats} ? ' [stats]' : ''); |
263 |
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|
264 |
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# read database |
265 |
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for (my $pos = $from_rec; $pos <= $to_rec; $pos++) { |
266 |
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|
267 |
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$log->debug("position: $pos\n"); |
268 |
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|
269 |
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my $rec = $self->{fetch_rec}->($self, $db, $pos ); |
270 |
|
|
271 |
|
$log->debug(sub { Dumper($rec) }); |
272 |
|
|
273 |
|
if (! $rec) { |
274 |
|
$log->warn("record $pos empty? skipping..."); |
275 |
|
next; |
276 |
|
} |
277 |
|
|
278 |
|
# store |
279 |
|
if ($self->{low_mem}) { |
280 |
|
$self->{db}->put($pos, $rec); |
281 |
|
} else { |
282 |
|
$self->{data}->{$pos} = $rec; |
283 |
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} |
284 |
|
|
285 |
|
# create lookup |
286 |
|
$self->{'lookup'}->add( $rec ) if ($rec && $self->{'lookup'}); |
287 |
|
|
288 |
|
# update counters for statistics |
289 |
|
if ($self->{stats}) { |
290 |
|
map { |
291 |
|
my $fld = $_; |
292 |
|
$self->{_stats}->{fld}->{ $fld }++; |
293 |
|
if (ref($rec->{ $fld }) eq 'ARRAY') { |
294 |
|
map { |
295 |
|
if (ref($_) eq 'HASH') { |
296 |
|
map { |
297 |
|
$self->{_stats}->{sf}->{ $fld }->{ $_ }++; |
298 |
|
} keys %{ $_ }; |
299 |
|
} else { |
300 |
|
$self->{_stats}->{repeatable}->{ $fld }++; |
301 |
|
} |
302 |
|
} @{ $rec->{$fld} }; |
303 |
|
} |
304 |
|
} keys %{ $rec }; |
305 |
|
} |
306 |
|
|
307 |
|
$self->progress_bar($pos,$to_rec) unless ($self->{no_progress_bar}); |
308 |
|
|
309 |
|
} |
310 |
|
|
311 |
|
$self->{pos} = -1; |
312 |
|
$self->{last_pcnt} = 0; |
313 |
|
|
314 |
|
# store max mfn and return it. |
315 |
|
$self->{max_pos} = $to_rec; |
316 |
|
$log->debug("max_pos: $to_rec"); |
317 |
|
|
318 |
|
return $size; |
319 |
|
} |
320 |
|
|
321 |
|
=head2 fetch |
322 |
|
|
323 |
|
Fetch next record from database. It will also displays progress bar. |
324 |
|
|
325 |
|
my $rec = $isis->fetch; |
326 |
|
|
327 |
|
Record from this function should probably go to C<data_structure> for |
328 |
|
normalisation. |
329 |
|
|
330 |
|
=cut |
331 |
|
|
332 |
|
sub fetch { |
333 |
|
my $self = shift; |
334 |
|
|
335 |
|
my $log = $self->_get_logger(); |
336 |
|
|
337 |
|
$log->logconfess("it seems that you didn't load database!") unless ($self->{pos}); |
338 |
|
|
339 |
|
if ($self->{pos} == -1) { |
340 |
|
$self->{pos} = $self->{offset}; |
341 |
|
} else { |
342 |
|
$self->{pos}++; |
343 |
|
} |
344 |
|
|
345 |
|
my $mfn = $self->{pos}; |
346 |
|
|
347 |
|
if ($mfn > $self->{max_pos}) { |
348 |
|
$self->{pos} = $self->{max_pos}; |
349 |
|
$log->debug("at EOF"); |
350 |
|
return; |
351 |
|
} |
352 |
|
|
353 |
|
$self->progress_bar($mfn,$self->{max_pos}) unless ($self->{no_progress_bar}); |
354 |
|
|
355 |
|
my $rec; |
356 |
|
|
357 |
|
if ($self->{low_mem}) { |
358 |
|
$rec = $self->{db}->get($mfn); |
359 |
|
} else { |
360 |
|
$rec = $self->{data}->{$mfn}; |
361 |
|
} |
362 |
|
|
363 |
|
$rec ||= 0E0; |
364 |
|
} |
365 |
|
|
366 |
|
=head2 pos |
367 |
|
|
368 |
|
Returns current record number (MFN). |
369 |
|
|
370 |
|
print $isis->pos; |
371 |
|
|
372 |
|
First record in database has position 1. |
373 |
|
|
374 |
|
=cut |
375 |
|
|
376 |
|
sub pos { |
377 |
|
my $self = shift; |
378 |
|
return $self->{pos}; |
379 |
|
} |
380 |
|
|
381 |
|
|
382 |
|
=head2 size |
383 |
|
|
384 |
|
Returns number of records in database |
385 |
|
|
386 |
|
print $isis->size; |
387 |
|
|
388 |
|
Result from this function can be used to loop through all records |
389 |
|
|
390 |
|
foreach my $mfn ( 1 ... $isis->size ) { ... } |
391 |
|
|
392 |
|
because it takes into account C<offset> and C<limit>. |
393 |
|
|
394 |
|
=cut |
395 |
|
|
396 |
|
sub size { |
397 |
|
my $self = shift; |
398 |
|
return $self->{size}; |
399 |
|
} |
400 |
|
|
401 |
|
=head2 seek |
402 |
|
|
403 |
|
Seek to specified MFN in file. |
404 |
|
|
405 |
|
$isis->seek(42); |
406 |
|
|
407 |
|
First record in database has position 1. |
408 |
|
|
409 |
|
=cut |
410 |
|
|
411 |
|
sub seek { |
412 |
|
my $self = shift; |
413 |
|
my $pos = shift || return; |
414 |
|
|
415 |
|
my $log = $self->_get_logger(); |
416 |
|
|
417 |
|
if ($pos < 1) { |
418 |
|
$log->warn("seek before first record"); |
419 |
|
$pos = 1; |
420 |
|
} elsif ($pos > $self->{max_pos}) { |
421 |
|
$log->warn("seek beyond last record"); |
422 |
|
$pos = $self->{max_pos}; |
423 |
|
} |
424 |
|
|
425 |
|
return $self->{pos} = (($pos - 1) || -1); |
426 |
|
} |
427 |
|
|
428 |
|
=head2 stats |
429 |
|
|
430 |
|
Dump statistics about field and subfield usage |
431 |
|
|
432 |
|
print $input->stats; |
433 |
|
|
434 |
|
=cut |
435 |
|
|
436 |
|
sub stats { |
437 |
|
my $self = shift; |
438 |
|
|
439 |
|
my $log = $self->_get_logger(); |
440 |
|
|
441 |
|
my $s = $self->{_stats}; |
442 |
|
if (! $s) { |
443 |
|
$log->warn("called stats, but there is no statistics collected"); |
444 |
|
return; |
445 |
|
} |
446 |
|
|
447 |
|
my $max_fld = 0; |
448 |
|
|
449 |
|
my $out = join("\n", |
450 |
|
map { |
451 |
|
my $f = $_ || die "no field"; |
452 |
|
my $v = $s->{fld}->{$f} || die "no s->{fld}->{$f}"; |
453 |
|
$max_fld = $v if ($v > $max_fld); |
454 |
|
|
455 |
|
my $o = sprintf("%4s %d ~", $f, $v); |
456 |
|
|
457 |
|
if (defined($s->{sf}->{$f})) { |
458 |
|
map { |
459 |
|
$o .= sprintf(" %s:%d", $_, $s->{sf}->{$f}->{$_}); |
460 |
|
} sort keys %{ $s->{sf}->{$f} }; |
461 |
|
} |
462 |
|
|
463 |
|
if (my $v_r = $s->{repeatable}->{$f}) { |
464 |
|
$o .= " ($v_r)" if ($v_r != $v); |
465 |
|
} |
466 |
|
|
467 |
|
$o; |
468 |
|
} sort { $a cmp $b } keys %{ $s->{fld} } |
469 |
|
); |
470 |
|
|
471 |
|
$log->debug( sub { Dumper($s) } ); |
472 |
|
|
473 |
|
return $out; |
474 |
|
} |
475 |
|
|
476 |
=head1 MEMORY USAGE |
=head1 MEMORY USAGE |
477 |
|
|
478 |
C<low_mem> options is double-edged sword. If enabled, WebPAC |
C<low_mem> options is double-edged sword. If enabled, WebPAC |